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All wedi Building Board sizes and thicknesses can be used as tile underlayments over concrete subfloors. Modified thinset mortar, combed through with a minimum 1/4” x 1/4” notch trowel, will then provide a ribbed bed into which the wedi Building Boards will be laid. All joints should be staggered so that no seam continues throughout the length of the floor. Apply weights (i.e. tile boxes) onto the surface and where transitions are located while the mortar is setting up. After the mortar has set, wedi alkali resistant fiberglass mesh tape, or wedi Sealing Tape or wedi Joint Sealant should be applied to all seams, then tiling can begin.
The boards are installed in a full coverage setting bed using modified thinset mortar allowing best connection between subfloor and wedi board.
Stagger all joints when laying wedi Building Boards on the floor. Apply some weights such as tile boxes equally distributed over the wedi board surface.
wedi Building Board wedi Joint Sealant